Scalable periphery tunable matching power amplifier

Abstract

A scalable periphery tunable matching power amplifier is presented. Varying power levels can be accommodated by selectively activating or deactivating unit cells of which the scalable periphery tunable matching power amplifier is comprised. Tunable matching allows individual unit cells to see a constant output impedance, reducing need for transforming a low impedance up to a system impedance and attendant power loss. The scalable periphery tunable matching power amplifier can also be tuned for different operating conditions such as different frequencies of operation or different modes.

The invention claimed is: 
     
       1. An amplification circuit, comprising:
 one or more amplifiers configured to be selectively activated or deactivated, wherein each amplifier of the one or more amplifiers comprises:
 a stack of a plurality of transistors, and 
 one or more gate capacitors connected to respective one or more transistors of the plurality of transistors; 
 
 
       wherein, in each amplifier:
 an input transistor of the plurality of transistors is configured to receive an input signal; 
 a cascode transistor of the plurality of transistors is configured to receive a cascode gate voltage held to a constant DC level regardless of the amplifier being active or inactive; 
 the one or more gate capacitors are connected between one or more gates of the respective one or more transistors and a reference ground with the exception of the input transistor, and 
 a non-bypassing gate capacitor of the one or more gate capacitors is configured to allow a gate voltage of a respective transistor of the plurality of transistors to vary along with a radio frequency (RF) voltage at a drain of the respective transistor. 
 
     
     
       2. The amplification circuit of  claim 1 , wherein each of the one or more amplifiers comprises a switch connected in series with a gate of the input transistor, the switch being configured to open or close the input signal path to the input transistor, thus selectively activating or deactivating a corresponding amplifier. 
     
     
       3. The amplification circuit of  claim 2 , wherein the switch is configured to selectively connect the gate of the input transistor to either the input signal or to a fixed voltage, so as to selectively activate or deactivate the one or more amplifiers. 
     
     
       4. The amplification circuit of  claim 1 , wherein each amplifier of the one or more amplifiers is a biased amplifier, a bias being applied to the biased amplifier. 
     
     
       5. The amplification circuit of  claim 2 , wherein each switch is controlled by a control circuitry of the amplification circuit. 
     
     
       6. The amplification circuit of  claim 1 , further comprising an output tunable matching network operatively connected to an output of the amplification circuit, wherein the tunable matching network is configured to adjust an output load impedance seen by the output of the amplification circuit. 
     
     
       7. The amplification circuit of  claim 6 , wherein the output tunable matching network comprises:
 one or more tunable reactive elements connected between the output of the amplification circuit and the output load; and 
 a tunable matching control circuit configured to tune the one or more tunable reactive elements to adjust the output load impedance seen by the output of the amplification circuit. 
 
     
     
       8. The amplification circuit of  claim 6 , wherein the output tunable matching network comprises:
 a first set of one or more tunable reactive elements placed in series between the output of the amplification circuit and the output load impedance; and/or 
 a second set of one or more tunable reactive elements placed in parallel with the output load impedance, and 
 a tunable matching control circuitry configured to tune the first set of the one or more tunable reactive elements and/or the second set of the one or more tunable reactive elements, thus adjusting the output load impedance seen by the output of the amplification circuit. 
 
     
     
       9. The amplification circuit of  claim 6 , wherein the output tunable matching network comprises a plurality of tunable matching networks arranged in one or more of a: a) π-configuration, b) t-configuration, and c) cascade configuration. 
     
     
       10. The amplification circuit of  claim 8 , wherein the one or more tunable reactive elements comprise one or more of: a) one or more digital tuning capacitors, and b) one or more digital tuning inductors. 
     
     
       11. The amplification circuit of  claim 8 , wherein the one or more amplifiers and one or more of: a) the output tunable matching network in entirety or in part, and b) the tunable matching control circuitry in entirety or in part, are monolithically integrated. 
     
     
       12. The amplification circuit of  claim 1 , further comprising a harmonic termination network connected to an output of the amplification circuit. 
     
     
       13. The amplification circuit of  claim 12 , herein the harmonic termination network comprises one or more tunable reactive elements. 
     
     
       14. The amplification circuit of  claim 13 , wherein the one or more tunable reactive elements are connected in one of a) series between the output of the amplification circuit and an output load or b) in parallel at the output of the amplification circuit, or a combination thereof.